^ cyl. pontiac grand am.. running very rough

My girl's car suddenly started to run like it was only firing on half the cylinders yesterday, I bought new plugs and changed them thinking she may have fouled a couple for some reason.. The old ones were in pretty bad shape.. This did'nt help so I checked all the wires one by one hooking a plug to them and starting the car to check each one for spark. all were good. Been around enough cars in My time to know that if You have fire, You should get some kick from the engine.. Wondering about the o2 sensor or possibly a bad fuel filter. Thought at first maybe even some bad gas but She drove out a half tank of what was in there before it started to run like this..And also it's not a rod knock or about the oil, just feels like a dead cylinder or something.. any thoughts?

Giving it gas does'nt help.. When it first happened for Her She did gun the car and it ran better till She got Home. Once in the driveway, it started to run really rough again and I havent been able to gun it to blow out the cobwebs so to speak...

is it 4 cyl or 6 cyl,if 4 what kind of spark plugs are in it,the 4 cyl onley likes the orig gm ac delco plugs,it wont run worth nothing withany other plugs,also if 4 cyl replace the boot covers for the plugs.

try taking the towwer cover off (qaud 4 engine)and using a test set of plug wires to connect from the coils to the plugs , reconnect the module and do a manual cylinder balance, you might have a bad ignition coil or a cracked coil towwer housing, most likly a bad coil .

Checked the coil pack. Even bought a new one and worked it through all 3 seats. Bad news got worse when I was checking them, the engine acted like it seized up. was actually running at a slow idol when it happened (car was about to stall). This DID NOT sound like the typical rod knock...My only hope is that this engine's timing belt jumped a few teeth and eventually let go completly causing extreem vapor lock, or an intake valve got caught open on a pistons tdc. Have to wait for the weather to clear to tow it to My garage tho.. (no fun working in a snowstorm).

what engine does this car have? A Quad 4 engine dosent have a timing belt. Its a chain driven motor and on high mileage Quad 4's its common for the chain to become loose as the spockets wear, also timming chain tensioners are very common too. Is this a 3.1 V-6 ? do you have any codes ? is the check engine lamp on ?

I re-read your first post and you said it started to run bad when you were at half a tank. Would be curious to see what you fuel pressure would be at idle, and after a few minutes sitting off. The fuel pressure spec for running is between 41-47psi, and should drop more then 5psi after sitting 10mins.

Was starting to lean torward the the fuel pressure being bad for what ever reason i.e. pump, bad filter. But now that the engine seem's to have seized up, I'm going to have to look into weather or not I lost the timing belt while I was trying to figure out what was going on with the car. When the engine was actually running, it was turning over like the timing was advanced way too far as I tried to start it up... It's a 3400 so Im not actually sure weather it has a timing belt, or chain ...

If its the 3.4 liter engine check the rocker arm studs.
General Motors changed from a 10 mm stud
To a 8 mm stud and the strip out the threads in the head if over revved.
I have had 3 studs pull out in 40000 miles
You have to retap and install a helicoil in the head. Just cost meme
650 bucks to have 2 redone and all others checked.

If the oxygen senser wires get pulled off of the cat.. wood this
cause my 02 2.2 garand am to just stop running?
I replaced fuel pump thinking it was not getting fuel from tank
an I replaced fuel filter. When car still ran I was about an hour
from home fishing. Started car to come home it drove
aproxmently a city block an thin cut out realy bad and nearly
wonted to go with a lilbit of shimmy an then died. About 4 min
later it half jazz started up an I floored it an it seemed to unbog
its self and got me a block from house and died an will not start
just wine an turn..also rewired them wires during break dwn. if
you know what it could please let me know

I had the same issue....a new Ignition Module was the fix.
I had it fixed 20,000 km ago by the dealership under warranty (58,000
km on the car at the time). I know have 78,000 km and it went again.
Except this time...my extended warranty expired the day before it
blew. Hoping I get them to fix it this time.

My car felt like it was going to stall when sitting at a red light so I would
put it in park and it would idle ok. As soon as it was in gear, the hitching
would continue without having gas pedal pressed. Limped it to the
dealership. I only drove about 8 km each time straight to the dealership.

If ya have a problem finding a leak in a hose find a kid on
your block that , so called "tunes", and have him smoke
check your hoses for a couple of bucks. They know how,
and it would take forever to describe the process. This is
a sure way to find out if its a leak.

I am looking at a 2003 Grand Am - the seller says that it will drive fine for about 30 minutes,
but will stutter and stall, but start back up. He said it is "rocker arm" anyone know what that
will cost me to fix?

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